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Effectiveness of green additives vs poly(acrylic acid) in inhibiting calcium sulfate dihydrate crystallization

Rabizadeh, Taher, Morgan, David J., Peacock, Caroline L. and Benning, Liane G. 2019. Effectiveness of green additives vs poly(acrylic acid) in inhibiting calcium sulfate dihydrate crystallization. Industrial & Engineering Chemistry Research 58 (4) , pp. 1561-1569. 10.1021/acs.iecr.8b02904

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ABSTRACT: The effects that 20 ppm poly(epoxysuccinic acid) (PESA), poly(aspartic acid) (PASP), and two poly(acrylic acid) (PAA) compounds with molecular weights of ∼2000 and ∼100000 have on the crystallization of gypsum were evaluated at 21 °C byin situ UV−vis spectrophotometry. XRD and SEM were utilized for phase and morphological studies, while the way these additives are associated with the final gypsum crystals was evaluated by XPS. The comparison showed that PASP performed far better than the other antiscalants as it completely inhibited the formation of gypsum. In contrary, the presence of the low molecular weight PAA decreased the rate of crystallization far more than the larger molecular weight PAA. When the pH in the reacting solution was switched from ∼4 to∼7, the efficiency of the low molecular weight PAA in inhibiting gypsum formation increased, while in the presence of the higher molecular weight PAA the opposite effect was observed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 0888-5885
Date of First Compliant Deposit: 14 September 2020
Date of Acceptance: 31 December 2018
Last Modified: 15 Sep 2020 07:45

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